Is it possible model a perspective image in orthographic view
Yes, but ...
You have to keep in mind that using photographs as reference images you will always have a bit of "distortion". Therefore use them only as loose reference, not as "set-in-stone-rules". 

If you start for example in the front-view, adding all the faces they will be completly flat, and if looked from any other angle, they will appear as a big plane without any structure. Now if you switch to side-view and start moving the verticies horizontal you'll get more and more "3d-ish".  

(maybe somebody can add explaining images to this answer)